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Graptolithina

      Graptolithina is the a class in the animal phylum Hemichordata, the members of which are known as Graptolites. Graptolites are fossil colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. The name graptolite comes from the Greek graptos, meaning "written", and lithos, meaning "rock", as many graptolite fossils resemble hieroglyphs written on the rock. Linnaeus originally regarded them as 'pictures resembling fossils rather than true fossils', though later workers, supposed them to be related to the hydrozoans.[citation needed] More recent work places them near the pterobranchs, possibly within.

Sources: http://en.wikipedia.org/wiki/Graptolite

On-line reference: Benton a Harper: Introduction to the Paleobiology

Zdroj: Benton a Harper: Introduction to the Paleobiology

Azygograptus leptothecaBouček (1973), text. fig. 136 BB136
Azygograptus leptotheca PP1420
Azygograptus suecicus XA781
Azygograptus suecicusBouček (1973), Pl. XIX, fig. 1-2, text. fig. 33a, b BB131
Azygograptus suecicusBouček (1973), text. fig. 33c BB133
Azygograptus suecicus BB188
Azygograptus suecicusBouček (1973), text. fig. 33d BB134
Azygograptus suecicus BB340
Azygograptus suecicus BB348
Azygograptus suecicus BB185
Azygograptus suecicus BB189
Azygograptus suecicus XA766
Azygograptus suecicus BB186
Azygograptus suecicusBouček (1973), text. fig. 33f, g BB132
Azygograptus suecicusBouček (1973), Pl. XIX, fig. 4 BB126
Azygograptus suecicusBouček (1973), Pl. XIX, fig. 6 BB127
Azygograptus suecicus BB187
Azygograptus suecicusBouček (1973), text. fig. 33e BB135
Azygograptus suscicus YA27
Barrandeograptus pulchellus JH106
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]